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Fetal Length Calculator

calculate fetal length for free

* Femur Length (FL) - Measures the longest bone in the body and reflects the longitudinal growth of the fetus. It increases from about 1.5 cm at 14 weeks to about 7.8 cm at term.

Femur length (FL) : mm


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The Fetal Length Calculator calculates the length of a baby in the womb according to the length of baby’s femur. Therefore, you shouldn’t worry if your doctor don’t tell you how long is your baby after an ultrasound. By using this calculator, you can find out that information with just a few clicks. 

How to use the Fetal Length Calculator?

Calculating of fetal length is very simple with our calculator. Just look at the ultrasound report that you get from the doctor. There are some measurements marked with AC, FL, BPD, HC. In order to calculate fetal length, you will need only the FL measurement, which represents the length of the femur. Enter the FL measurement in the highlighted box above and then get the length of your baby.

The Recommendation

If you want to calculate the weight of your baby, you can use our Fetal Weight Calculator. Also, in order to find out whether the length and weight of your baby is in line with the average length and weight of a baby in the same gestation week, see The Fetal Growth Chart

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2 thoughts on “Fetal Length Calculator

  1. I need to check the weight of my baby also. You should make the fetal weight calculator too… I don’t want to go on other sites to check that. I like this very much… You are excellent! :-*

  2. I come here to calculate the length of my baby after every ultrasound… Thank for this calculator!

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